The most famous fractal equation is the 2D Mandelbrot set, named after the mathematician Benoît Mandelbrot of Yale University, who coined the name “fractals” for the resulting shapes in 1975.

From bats to jack-o-lanterns, Rorschach’s inkblots brought out a vast array of image associations during their use, with up to 300 different images recorded for each of the 10 blots. Now ...